Optical element driving mechanism
US5554843A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 1994 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Sep 6, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/093
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical element driving mechanism is disclosed wherein an electromagnetic motor positions an optical element such that a laser beam passing through the optical element is focused onto an optical disk media. The optical element can be translated in two axes by energizing coils suspended within stationary magnetic fields produced by permanent magnets. The magnitude and direction of displacement is controlled by the current passing through the coils. A two axis electro-optical position sensing apparatus for determining the position of the optical element is embedded within the driving mechanism. The position sensing apparatus detects the relative position of the optical element in two axes by imaging a light emitting diode onto a four element photodetector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.